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The emission positions of kHz QPOs and Kerr spacetime influence |
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| Authors: | Zhang ChengMin Wei YingChun Yin HongXing Zhao YongHeng Lei YaJuan Song LiMing Zhang Fan Yan Yan |
| Affiliation: | 1.National Astronomical Observatories, Chinese Academy of Sciences, Beijing, 100012, China ;2.Institute of High Energy Physics, Chinese Academy of Sciences, 19B Yuquan Road, Beijing, 100049, China ;3.Urumqi Observatory, National Astronomical Observatories, CAS, Urumqi, 830011, China ; |
| Abstract: | Based the Alfven wave oscillation model (AWOM) and relativistic precession model (RPM) for twin kHz QPOs, we estimate the emission positions of most detected kHz QPOs to be at r=18+/−3 km (R/15 km), except Cir X-1 at r∼30+/−5 km (R/15 km). For the proposed Keplerian frequency as an upper limit to kHz QPO, the spin effects in Kerr Spacetime are discussed, which have about a 5% (2%) modification for that of the Schwarzchild case for the spin frequency of 1000 (400) Hz. The application to the four typical QPO sources, Cir X-1, Sco X-1, SAX J1808.4-3658 and XTE 1807-294, is mentioned. |
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